西欧汽车工业用材每年化费170亿美元。减轻目前的汽车重量必须改变用材情况。据Frost of Sullivan国际研究组织报道,许多汽车用钢和铸铁部件将被塑料和铝制部件所代替,1983年西欧汽车用钢和铸铁占整个用材的75%,塑料和铝占9%。1990～1993年汽车用钢和铸铁的比例将有所下降,占66.5%,而塑料和铝将占18.5%,比1983年将翻一番。从1988年 West Europe auto industry material costs 17 billion US dollars annually. Reduce the current car weight must change the timber situation. According to the Frost of Sullivan International Research Institute, many automotive steel and cast iron parts will be replaced by plastic and aluminum parts. In 1983, steel and cast iron for Western Europe accounted for 75% of the total wood and plastic and aluminum accounted for 9%. From 1990 to 1993, the proportion of automotive steel and cast iron will decrease, accounting for 66.5%, while plastic and aluminum will account for 18.5%, doubling the amount of 1983. From 1988